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The Weight Change of SAPO-34 Catalyst During MTO Process in TGA Reactor

机译：TGA反应器MTO过程中SAPO-34催化剂的重量变化

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The Thermax 700 thermo gravimetric analysis (TGA) instrument is introduced for the investigation of the weight change of SAPO-34 catalyst during methanol-to-olefin (MTO) process. By the use of a special sample basket with screen bottom, the TGA instrument can be viewed as fixed-bed reactor, while the weight change of SAPO-34 during MTO reaction can be recorded online. It is noticed that the SAPO-34 catalyst experiences a procedure of dehydration as furnace temperature rises; hence the weight increase of SAPO-34 during MTO reaction should be calculated based on the weight after dehydration. It is checked that the increase of weight is mainly coke ignore of adsorbates. In the range of 648-773K temperature and 7.08-35.9W' (WHSV) space velocity, the maximum coke deposition is roughly 25% independent of reaction condition. The coke formation experiences a stage of fast increase soon after reaction initiates, while slows down apparently after 18% coke is deposited on the catalyst. Higher temperature, space velocity and methanol partial pressure accelerate the coking rate. Temperature plays an important role in the type of coke formation, which can be distinguished directly by the colour of completely deactivated catalyst. The deactivated catalyst in lower temperature experiences a weight loss with partly recovery of catalyst activity as temperature rises in the hydrothermal atmosphere. The phenomenon of weight loss with catalyst regeneration will not occur as reaction temperature decreases for deactivated catalyst, as well as the different DTA curves for coke burning, are also evidences for the different type of coke formation on SAPO-34 catalyst in different reaction temperature.
机译：Thermax 700热重量分析（TGA）仪器被引入研究甲醇 - 烯烃（MTO）过程中SAPO-34催化剂的重量变化。通过使用特殊的样品篮式屏幕底部，TGA仪器可以被视为固定床反应器，而MTO反应过程中SAPO-34的重量变化可以在线记录。注意到SAPO-34催化剂经历了熔炉温度升高的脱水程序;因此，应基于脱水后的重量计算MTO反应过程中SAPO-34的重量增加。检查重量的增加主要是焦炭忽视吸附物。在648-773k温度范围内，7.08-35.9W'（WHSV）空间速度，最大焦沉积大约与反应条件无关的25％。焦炭形成经历了在反应启动后不久的快速增加的阶段，而在催化剂上沉积18％焦炭后显然放缓。温度较高，空间速度和甲醇部分压力加速焦化率。温度在焦炭形成类型中起重要作用，可以通过完全失活催化剂的颜色直接区分。在较低温度下的失活催化剂经历重量损失，随着水热气氛中的温度升高，部分地回收催化剂活性的重量损失。随着反应温度降低的反应温度降低，以及用于焦炭燃烧的不同DTA曲线，对于不同反应温度的不同类型的焦炭形成，也不会发生催化剂再生的体重减轻的现象，以及用于不同反应温度的SAPO-34催化剂上的不同类型的焦炭形成证据。

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